Lip with exchangeable noses

ABSTRACT

A rolled lip in which the form of attachment of the noses to the lip prevents the area of attachment to reach a maximum stress, thus reducing the risk of fractures in said area of attachment facilitating machining of the nose in which the lip has grooves projecting from the edge into the lip body; the noses have an area which forms a protrusion in which said protrusion is located in the rear half of the nose on the opposite side of the front; the attachment of the protrusion to the lip is welded all around it and forms one or two channels forming a weld filler area; the shape, quantity and distribution of the channels may vary independently using a channel on the lip or a channel under the lip or a channel on the lip and another under the lip simultaneously; the weld filler area may be above and/or below the lip; the protrusions of the noses fit in the grooves of the lip.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of co-pending Chilean Patent Application No. 0406-2016, filed 23 Feb. 2016, which is incorporated herein as though fully set forth.

TECHNICAL FIELD

The present disclosure is developed in the field of elements for earthwork equipment, it is specifically related to a large rolled and folded or cast steel lip for excavator bucket, and a method for attachment of the lip to the noses.

DESCRIPTION OF THE PRIOR ART

In the prior art, the nose and lip are usually an integral piece of cast steel. In this case, the area where the maximum stress occurs is at the base of the nose, in a plane that is normal to the longitudinal axis of the nose.

Application US D705,275 is part of the prior art. Said document discloses in FIG. 1 the usual way in which the noses are attached to form a lip. In this case, the nose is attached by direct flush welding on the front edge of the lip. In this attachment setting, a maximum stress is required at the base of the nose, in a plane that is normal to the longitudinal axis of the nose, as explained above.

The attachment solution of the present invention proposes an attachment that is outside the plane of maximum stress, because the nose is not welded to the edge of the lip, resulting in an increased reliability of the attachment of the nose to the lip.

Application U.S. Pat. No. 5,709,043 is also a part of the prior art, which shows an attachment of a lip to a nose, in which the attachment of these two components is carried out partially on the edge (z) of contact between the tooth and the lip, as shown in FIG. 2. It can be seen that the attachment is carried out on the back of the tooth on the surface of the lip and around it, which, due to the use, tends to cause a rupture in the attachment in the area indicated x-x. Faced with this problem, the present invention prevents this rupture because the attachment by welding the back of the nose is carried out butt, reaching full penetration, and the back of the nose is introduced into a groove, preventing the stress indicated.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a lip of the prior art, in which a traditional method of attaching the noses to the lip is observed.

FIG. 2 shows a detail of a lip of the prior art, where the parts which require the stress of the noses are shown.

FIG. 3 shows a lip with the nose attaching system of the present invention

FIG. 4A shows a top view and detail of an installed nose according to the attaching system of the present invention and FIG. 4B shows a top isometric view and detail of an installed nose, according to the attaching system of the present invention.

FIG. 5 shows a nose of the present invention that has not been attached to the structure of the lip.

FIG. 6 shows a lip of the present invention, in which noses have not been attached.

FIG. 7 shows a view and a cut of the attachment of the nose to the lip.

DETAILED DESCRIPTION OF THE INVENTION

The Invention proposed modifies the initial design of a lip, preventing that the area of attachment of the noses to the lip (1), which can be rolled or cast steel, whatever it reaches the maximum stress, and the design is optimized by moving the welding attachment (2) away from the area of maximum stress, thus reducing the risk of fractures in the area of attachment of the nose to the lip, and possible ruptures caused by excess impact load on the lip (1). Other advantages of using this attachment system for teeth (3) are that machining of the nose is facilitated since the nose is manufactured independently, facilitating the attachment of said nose, and also that low stress occurs in the area of welding. Noses are made of high-strength structural steel, anti-abrasive steel or impact-resistant steel.

The proposed invention considers a lip with grooves (4) projecting from the edge (11) into the lip body (1), which are machined or oxy-cut and fit perfectly with protrusions (7) located in an area in the rear half of the nose (3), on the opposite side of the front (8). Said protrusions (7) are welded inside the groove (4) all around it and in its entire thickness, forming a single continuous welding and forming a weld filler area attachment (2) of great firmness between the nose (3) and the lip (1). The shape of the protrusion (7) and the grooves on the lip (4) may be any which provides a good attachment and straight and curved edges, and said shape is not necessarily limited to that illustrated in the figures of this utility model. The carving of the grooves is carried out using semi-automatic oxy-cut or machining (milling).

The attachment of the protrusion (7) of the nose to the groove (4) of the lip comprises one or two channels (14), as shown in FIG. 7, which shows two channels (14), top and bottom, which at the time of welding form a weld filler area (2) which may be above and/or below the lip (1). The shape, quantity and distribution of the channels (14) may vary using independently a channel on the lip or a channel under the lip, or as illustrated in FIG. 7, a channel on the lip and another under the lip simultaneously. The welding used may be cored wire, stick electrode or any other that applies to the type of steel. 

1. A rolled lip in which the form of attachment of noses to the lip prevents the area of attachment to reach a maximum stress, thus reducing the risk of fractures in said area of attachment, wherein: the lip has a plurality of grooves projecting from an edge into a lip body; the noses have an area which forms a protrusion, wherein said protrusion is located in a rear half of the nose on an opposite side of a front of the nose; the protrusion is attached to the lip by a weld forming one or two channels around at least one of the plurality of grooves, forming a weld surrounding the rear half of the nose; the weld being above and/or below the lip; and the protrusions of the noses fit entirely within the grooves of the lip.
 2. A rolled lip according to claim 1, wherein the attachment of the protrusion to the lip includes welding using cored wire or a stick electrode.
 3. A rolled lip according to claim 1, wherein the lip is rolled or cast and the grooves are machined or oxy-cut in the lip.
 4. A rolled lip according to claim 3, wherein the grooves are carried out with semiautomatic oxy-cut or machining.
 5. A rolled lip according to claim 1, wherein the noses comprise steel. 